vygr/ChrysaLisp: Parallel OS, with GUI, Terminal, OO Assembler, Class libraries, C-Script compiler, Lisp interpreter and more...
A Lisp-based operating system that can be run on many machines, and under the "main" OS.
Running Open Genera 2.0 on Linux
A guide (that, as per the into, is now kind of old) to getting Open Genera running on GNU/Linux.